Castillo's contract begins in 2014, though it is not yet clear whether he is expected to appear in the majors this season. The deal is heavily backloaded, according to the report, with very little money paid out for the truncated 2014 season.
Though he expects to be in the majors when rosters expand Sept. 1,
"It's serviceable," Perez said. "I feel good. I'm still trying to build up the strength in it."
Perez has a 5.03 ERA in the majors this season, and is trying to work his way back from bone spurs in his ankle. He does not expect to undergo surgery to remove them, so he will have to manage the pain. He is currently on a rehab assignment at Class A Rancho Cucamonga, where he will make one more appearance next Friday.
According to the report, the Red Sox have nearly reached an agreement with the Cuban free agent on a six-year deal worth $72 million. That deal would top the $68 million contract Jose Abreu signed last year.
Eaton, who has been out two weeks with a strained right oblique, could be back from the disabled list as early as Tuesday, when the team opens a series against the Indians.
Parker appeared in Thursday's game, allowing two hits and striking out two batters over one scoreless inning of relief. It lowered his season ERA to 6.08 in 13 1/3 innings.
Kershaw went eight innings strong for the win at home on Thursday, improving to 15-3 on the year. The southpaw permitted one run on three hits and two walks while striking out 10 in a 2-1 victory. Of his 103 pitches, 69 were strikes. He improved to 15-3 on the year, matching Johnny Cueto, Wily Peralta and Adam Wainwright for the major-league lead in victories.
Over his last three starts covering 25 innings, Kershaw has allowed five earned runs. He has gone eight-plus innings in seven of his last nine starts. He owns a 1.82 ERA and a 0.83 WHIP over 21 starts (153 1/3 innings). He will make his next start Wednesday at Arizona.